Design And Implementation Of Software And Hardware Integrated Orchestration For Sdn-Based Service Chain

With the development of network technology and the rapid growth of network business demand,the fast and flexible delivery of network services has become the focus of network operators and network service providers.In the traditional campus network scenario,network equipment is usually deployed in series in the traffic forwarding path,resulting in poor network scalability,inflexible business deployment,low network resource utilization and high operation and maintenance costs.Although the problem of poor network scalability can be solved by attaching network devices such as firewalls to the core switch and building a service chain,the fundamental problems of inflexible business deployment,low network resource utilization and high operation and maintenance cost have not been solved because the service chain still relies on dedicated hardware devices.In view of the above problems,this paper designs and builds a soft and hard integrated scheduling system.The main research results are summarized as follows:1.When researching the flexibility of business deployment,it was found through theoretical analysis and experiments that the tabs or Virtual Extended Local Area Network(VXLAN)-based traffic guidance was easy to cause Network congestion,which resulted in the performance degradation of OVS(Open v Switch)forwarding.The analysis in this paper shows that the pre-identification of the forwarding path of traffic at the control level can reduce the message overhead,reduce the risk of network congestion,and reduce the loss of OVS forwarding performance.Therefore,this paper designs a traffic guidance method based on interface mapping,and gives a loop detection method of traffic path.2.In the study of business deployment flexibility,based on the Physical Network Function according to the actual deployment scenario analysis(Physical Network Function,PNF)service chain scheduling scheme not only relies on the operation mode of the service node and Physical switch configuration is complex,if the deployment VNF working mode for restrictions on the server,so business flexible deployment is very limited.Therefore,this paper designs a mixed deployment method of VNF to remove the dependence of the physical switch on the VNF working mode,and at the same time simplify the configuration of the physical switch to realize the flexibility of business deployment.3.When researching the low utilization of network resources,this paper finds that VNF on the service chain is not limited by the deployment location,which is the key to improving the utilization of network resources,which involves the cross-server choreography of the service chain.Therefore,this paper abstractly models the service chain resources and designs a cross-server choreography method to improve network resource utilization.4.When researching the state detection of service chain,this paper finds that there is no set of unified state detection methods.Therefore,this paper proposes a weight-based service chain state measurement algorithm to detect the state of the service chain in real time.Through the verification of the above scheme in the actual deployment environment,the service chain soft and hard integrated orchestration system implemented in this paper can reduce the risk of network congestion on the traffic guidance method,and improve the performance of traffic forwarding by 20% ～ 25%compared with the traffic guidance method based on labels or VXLAN.In terms of improving the flexibility of business deployment and network resource utilization,not only the mixed deployment of different working mode VNF and the cross-server choreography of service chain are realized,but also the minut-level rapid deployment of business is realized.In the aspect of service chain fault monitoring,millisecond fault response and chain switch are realized.